hey sleepy, if you wanna just do for fun project, imho, you can just get the components from simlim tower. Although it might be a bit more expensive as in the lm833 you ask, but if you dont mind swapping those op amp, you can use other type, tl072 being the most common, easily found and cheaper, $0.80 to $1.00 for a piece. The price difference if you buy more, 10 piece and above from SL tower, it can be cheaper by few cent of sorts.
Although there might be a different in the sound, you can interchange various type(shud not affect the over functionality of the circuit). So far i have gotten ne5532/5534, jrc4558, tl061/62/71/72/81/82, lm833 and some others from simlim to incterchange in the circuit i was doing for fun, it will work, althought the sound will vary by a bit here and there
for the ac tranny, if you wanna for FF, theres lotsa variation of the circuit schem around using silicon transistor for the built, those shud work also and easier to get parts from sim lim
so far i managed to get round 30 piece of ac 188 tranny from SL tower, kinda suprised to find it hidden in some corners round there. I wanted to do some fuzz pedal with those also. But i suspect it shud be quite leaky.
anyway, if you wanna get those germanium transisotr for built, best if the seller already match the gain or test for leakage. If not the article from rg keen(technology of fuzz face) and small bear has article on testing those germanium transitor for leakage and hfe which might be useful